Link to Wikipedia:
https://en.wikipedia.org/wiki/Mack_Trucks
Link to IMCDb listing:
http://www.imcdb.org/vehicles_make-Mack.html
autowp.ru is a nice website for factory pictures, but is definitely not a trustworthy source concerning the model years.
Timeline:
1910's
1916-38 Mack AC Tanker
Latest Edition: 05/04/2016 @ 20:41:56